Exchange bias in Cr/Gd multilayers with TC < TN
Exchange bias in Cr/Gd multilayers with TC < TN
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DOI：
10.1016/j.jallcom.2008.02.034
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发表时间：
2008-09
影响因子：
6.2
通讯作者：
Z. Jiao;Z. Jiao;W. Jiang;P. Si;G. Ye
中科院分区：
文献类型：
--
作者：
Z. Jiao;Z. Jiao;W. Jiang;P. Si;G. Ye
我们报道了Cr/Gd多层膜中的交换偏置现象，其中铁磁Gd的居里温度（TC）略低于反铁磁Cr的Néel温度（TN）。与传统的反铁磁（AFM）/铁磁（FM）多层膜（TC>TN）相比，样品的交换偏置场（HE）和矫顽力（HC）表现出异常的温度依赖性。结果表明，热膨胀系数和热膨胀系数的温度依赖性与Cr中间层的厚度有关。对于[Cr（20.4nm）/Gd（18 nm）] 5多层膜，铁磁行为和交换偏置现象在T>TN时持续存在，观察到振荡的HE和非单调的HC随温度的变化。由于Cr层的自旋密度波自旋结构和界面处Cr层与Gd层之间的非共线耦合，导致了He和Hc的反常温度依赖性。
We report on the exchange bias phenomenon in Cr/Gd multilayers in which the Curie temperature (TC) of the ferromagnetic Gd is slightly less than the Néel temperature (TN) of the antiferromagnetic Cr. The exchange bias field HEand the coercivity HCof the samples display unusual temperature dependence behaviors in comparison with those of the traditional antiferromagnet (AFM)/ferromagnet (FM) multilayers with TC>TN. It is shown that the temperature dependence of HEand HCrelates to the thickness of the Cr interlayer. For [Cr(20.4nm)/Gd(18nm)]5multilayers, the ferromagnetic behavior and exchange bias phenomenon persist to T>TN; Oscillatory HEand non-monotonic HCwith the temperature are observed. The anomalous temperature dependence of HEand HCresults from the spin-density wave spin structure of the Cr layer and the non-collinear coupling between the Cr and Gd layers at the interfaces.